Question

the vertical angle of an isosceles triangle is 110 degrees.What must be the size of each of the base angle ?

Answer 1

the sum of angles are 180.
vertiacal angle is 110 degree.
other angles must be equal.
180-110=70
70/2=35
the other angles are 35 degree each

Answer 2

isosceles triangle means two angles are equal .
let each of equal angle =x
now ,
we know sum of all angles =180 degree
x+x+110=180
2x=70
x=35
hence 35 degree , 35 degree and 110 degree are the angles of isosceles triangle .